.44 Henry
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The .44 Henry, also known as the .44 Henry Flat, the .44 Rimfire, the .44 Long Rimfire, and the 11x23mmR in Europe, is a rimfire rifle and handgun cartridge featuring a .875 in-long brass or copper case. Wikipedia
Base diameter: .441 in (11.2 mm)
Maximum pressure (CIP): 14,500 psi (100 MPa)
Produced: 1860–1920s/1930s